Castair Air Compressor Pressure Switch — 95-125 / 145-175 / 15-230 PSI, UL/CSA Listed The pressure switch is what tells your compressor when to run and when to stop — cutting power to the motor when the tank reaches cut-out pressure and restarting it at cut-in. These genuine Castair switches are UL/CSA listed, easy to adjust, and built with corrosion-resistant covers for long service life. Available in low-pressure (95-125 PSI), high-pressure (145-175 PSI), and wide-range adjustable (15-230 PSI) versions, with or without an unloader, on/off lever, and four-way porting. Supplied by Castair, a family-owned Minnesota manufacturer since 1991. Why It's Different: Match the switch to how your compressor runs. The PSI range should bracket your operating pressure — 95-125 for most single-stage units, 145-175 for two-stage 175 PSI compressors, or the adjustable 15-230 for custom setups. The unloader versions bleed head pressure off the pump so the motor restarts under no load (most belt-drive compressors need this), the on/off lever adds manual control, and the four-way versions simplify plumbing. A separate unloader valve (PSUV) is also available as a replacement part. Best For: Replacing a failed or worn pressure switch, building or repairing a compressor, or completing a tankless Cube power unit (which requires a pressure switch to operate). Configuration: Choose your PSI range and features — low (95-125), high (145-175), or adjustable (15-230), with the unloader / on-off / four-way combination your setup needs. ⚠️ BEFORE YOU ORDER — PLEASE READ: • Match the PSI range to your compressor's operating pressure (e.g., a 175 PSI two-stage unit needs a 145-175 switch). • Unloader: most belt-drive compressors require an unloader version for proper restart — confirm whether your setup needs one. • Electrical: the switch's voltage/amp rating must match your motor; wiring should be done by a qualified person to local code. It is the customer's responsibility to verify pressure range, unloader requirement, and electrical compatibility before purchase and installation. Features UL/CSA listed for safety and compliance Corrosion-resistant covers for long service life Easy to adjust cut-in / cut-out settings Three pressure ranges — 95-125, 145-175, and adjustable 15-230 PSI With or without unloader for load-less restart Optional on/off lever and four-way porting Adjustable-differential version (PSAD15-230) for custom setups Required component for tankless Cube power units Specifications Castair Pressure Switches — UL/CSA Listed Part # PSI On/Off Description PSL1 95-125 No unloader PSL1X 95-125 With unloader PSL1MIX 95-125 With unloader & on/off PSL4MIX 95-125 With unloader, on/off & four-way PSH1 145-175 No unloader PSH1X 145-175 With unloader PSH1MIX 145-175 With unloader & on/off PSH4MIX 145-175 With unloader, on/off & four-way PSAD15-230 15-230 No unloader, adjustable differential PSUV — Pressure switch unloader valve (replacement part) Shared Specifications Manufacturer Castair (Spicer, Minnesota — family-owned since 1991) Type Air compressor pressure switch Pressure Ranges 95-125, 145-175, and 15-230 PSI (adjustable) Options Unloader, on/off lever, four-way porting Cover Corrosion-resistant Certification UL/CSA listed Brand Castair What's Included One (1) Castair pressure switch per the model selected (or unloader valve for PSUV) (Switch only — wiring, fittings, and tubing not included. Match the PSI range and unloader configuration to your compressor. Contact us to confirm fitment.) Manuals & Documentation Castair Pressure Switch Wiring & Adjustment Guide (PDF)
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